ACM Crossroads: Operating Freely
Description of the 3 major, freely available, Unix-like operating systems: Linux, FreeBSD, NetBSD. Crossroads is the student magazine of the ACM.

COTSE-Mini UNIX Distributions
Links to 2 dozen mini Unix distributions: mostly Linux, also FreeBSD, SCO, Solaris MINIX, MINIX. You Would also find info related to technical references, hacking, forensics, consulting, security, service, computer security, boxes, resources, tools, download, encryption, sniffing tools, port scanners, port monitors, patches, exploits, fixes, news, spoofing, password, bugs, technology, hacker, crackers, virus, and much more.

Linux and BSD, Open Source Giants
Succinct, clear, non-technical introduction to Linux and BSD, focus: how they are relevant to business.

Thix
Unix kernel written in 1994-95; almost full implementation of POSIX.1 standard, IEEE Std 1003.1-1988. Goal: mainly to learn OS design, architecture, kernel algorithms, resource allocation, process scheduling, and memory management; free software has been compiled for it. [Open Source, GPL]

Open Source Unix and Related Software Projects
Small page of logos and links to resources, distribution channels for the most popular, freely distributable Unix, and a few other projects. FREENIX links in English, Français, Norsk. You Would also find info related to Freenix, UNIX, Linux, BSD, FreeBSD, NetBSD, OpenBSD, CD-ROM, GNU, Free Software Foundation, Open Source Software and much more.

osOpinion: Case Study: Renaissance of UNIX; a Good Thing?

PIOS: Pleasant Interactive Operating System
Free Unix clone developed by PIE Software Inc., for x86 PC compatibles, to give a stable multi-user high security platform for use as a network server, programming work-horse, or desktop system; designed so even complex tasks are easy. You Would also find info related to computer, system, operating, bios, rom, boot, cdrom, disk, unix, free, software, download, pc, x86, program, bineries and much more.